li-fi technology

Visible Light Communication (VLC)

VLC is a method of data communication; it uses visible lighting between the ranges of 400 and 800 THz in the electromagnetic spectrum. Due to the light emitted by LEDs, this method of data transmission can actually be perceived by humans. On the other hand, changes in the high frequencies can’t be perceived by the human eye. The use of light as a means of data transmition doesn’t affect in any way the human body, whereas the effect of radio waves may be hazardous on the human body.

By using ordinary fluorescent lamps – without any special or additional device, VLC can transmit signals that can achieve up to 10 kbit/s. When LEDs come into play, transmission speed can go up to more than 500 Kbit /s. Even at a low rate, VLC can potentially transmit at a distance range of 1-2 km. A photodiode receptor is a electronic device specially designed for the function of receiving information from different light sources and it is required to make this method of communication possible.